Light bulb



FIG. 1 is a perspective view of a light bulb;

FIG. 2 is a left side elevation view of the light bulb;

FIG. 3 is a front elevation view of the light bulb;

FIG. 4 is a right side elevation view of the light bulb;

FIG. 5 is a rear elevation view of the light bulb;

FIG. 6 is a top plan view of the light bulb; and,

FIG. 7 is a bottom plan view of the light bulb.

The broken lines are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a light bulb, as shown and described. 